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We report the discovery of a brown dwarf that transits one member of the M+Mbinary system LHS6343AB every 12.71 days. The transits were discovered usingphotometric data from the Kelper public data release. The LHS6343 stellarsystem was previously identified as a single high-proper-motion M dwarf. We usehigh-contrast imaging to resolve the system into two low-mass stars with masses0.45 Msun and 0.36 Msun, respectively, and a projected separation of 55 arcsec.High-resolution spectroscopy shows that the more massive component undergoesDoppler variations consistent with Keplerian motion, with a period equal to thetransit period and an amplitude consistent with a companion mass of M_C = 62.8+/- 2.3 Mjup. Based on an analysis of the Kepler light curve we estimate theradius of the companion to be R_C = 0.832 +/- 0.021 Rjup, which is consistentwith theoretical predictions of the radius of a > 1 Gyr brown dwarf.

LHS6343C: A Transiting Field Brown Dwarf Discovered by the Kepler Mission